Sh2-9, M 4, and others (Alex Woronow)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: M 4 · NGC 6121 · The star Al Niyat (σSco)

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Sh2-9, M 4, and others

Powered byPixInsight

Sh2-9, M 4, and others

Sh2-9, M 4, and others

OTA: RH-305 (12” f/3.5)

Camera: SBIG STX-16803

Observatory: Deep Sky West

EXPOSURES:

-Red: 8 x 600

-Blue: 8 x 600

-Green: 7 x 600

-Lum: 11 x 600

Total exposure 6.7 hours

Image Width: 1.9 deg

Processed by Alex Woronow using PixInsight, Topaz, SWT

Some old data, from 2018, resurrected for a quickie processing. The data were acquired when Deep Sky West was testing their then new RH-305. Not too many subs per filter, but at f/3.5, a 600-second exposure goes pretty deep. One thing that certainly surprised me was the image clarity, given the -25 degree declination of this FOV and the observatories +35 degree location. (The max altitude was 30 degrees at meridian transit.)

I counted all the stars in this image--no, I didn’t--but SubframeSelector got a ~17,000 on the best L sub. A stack might have reveal more, despite the nebula obscuring quite a few.

I hope you find the image interesting

Alex

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced failed
Started	...
Astrometry.net job	4465227
PixInsight job	RDWUOUEIT7K1H42KWLPN40A6J2XXXJOK
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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Sh2-9, M 4, and others

Sh2-9, M 4, and others

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Sh2-9, M 4, and others

Sh2-9, M 4, and others

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Comments

Acquired at

Sky plot

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